Try to avoid random failure
https://rubyci.org/logs/rubyci.s3.amazonaws.com/openbsd-current/ruby-master/log/20191015T070011Z.fail.html.gz
1) Failure: TestProcess#test_kill_at_spawn_failure [/home/chkbuild/chkbuild/tmp/build/20191015T070011Z/ruby/test/ruby/test_process.rb:2276]: [ruby-core:69304] [Bug #11166]. <#<Thread:0x000009f60a7cac40@/home/chkbuild/chkbuild/tmp/build/20191015T070011Z/ruby/test/ruby/test_process.rb:2272 dead>> expected but was <nil>. ``
Try to avoid random failure
https://rubyci.org/logs/rubyci.s3.amazonaws.com/openbsd-current/ruby-master/log/20191015T070011Z.fail.html.gz